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lines changed Original file line number Diff line number Diff line change @@ -1148,13 +1148,14 @@ def write_eof(self):
11481148            self ._sock .shutdown (socket .SHUT_WR )
11491149
11501150    def  writelines (self , list_of_data ):
1151-         hasbuffer   =   len ( self ._buffer ) 
1152-         self . _buffer . extend ([ memoryview ( i )  for   i   in   list_of_data ] )
1153-         if  not  hasbuffer :
1154-             # Optimization: try  to send now 
1155-              self . _write_ready () 
1151+         if   self ._eof : 
1152+              raise   RuntimeError ( 'Cannot call writelines() after write_eof()' )
1153+         if  self . _empty_waiter   is   not   None :
1154+             raise   RuntimeError ( 'unable  to writelines; sendfile is in progress' ) 
1155+         if   not   list_of_data : 
11561156            return 
1157-         self ._maybe_pause_protocol ()
1157+         self ._buffer .extend ([memoryview (i ) for  i  in  list_of_data ])
1158+         self ._loop ._add_writer (self ._sock_fd , self ._write_ready )
11581159
11591160    def  can_write_eof (self ):
11601161        return  True 
Original file line number Diff line number Diff line change @@ -810,7 +810,7 @@ def test_write_ready(self):
810810        self .sock .send .return_value  =  len (data )
811811
812812        transport  =  self .socket_transport ()
813-         transport ._buffer .extend (data )
813+         transport ._buffer .append (data )
814814        self .loop ._add_writer (7 , transport ._write_ready )
815815        transport ._write_ready ()
816816        self .assertTrue (self .sock .send .called )
    
 
   
 
     
   
   
          
     
  
    
     
 
    
      
     
 
     
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